[Radiance-general] effectiveness of light shelves

[Guedi Capeluto]

Hi Ramana,

I think it will be imprecise to answer your question in terms of black or
white. In fact it depends on several factor such lightshelf type, geometry,
size, location, materials, window orientation and size, room dimensions, sky
conditions ("luminous climate"), building maintenance among others.

Sometimes, controlling the amount of radiation entering a room and therefore
reducing very high light levels close to the window wall helps creating a
comfortable lighting environment, by reducing the contrast between levels at
the view window and those at the back of the room, yet sacrificing on
illuminance levels.
Best regards,

Guedi Capeluto

Arch. Guedi Capeluto, D.Sc.
Faculty of Architecture and Town Planning
Technion - Israel Institute of Technology
Technion City,  Haifa 32000. Israel
Tel:+972.4.8294012  Fax:+972.4.8294617
email:   arrguedi at tx.technion.ac.il
web  :   http://tx.technion.ac.il/~arrguedi      

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Message: 1
Date: Fri, 28 Jul 2006 14:56:13 -0500
From: "Ramana Koti" <ramana.koti at gmail.com>
Subject: [Radiance-general] effectiveness of light shelves
To: "Radiance general discussion"
	<radiance-general at radiance-online.org>
Message-ID:
	<cdf76d820607281256p6e738d61s2d8c5be1c0b75c8 at mail.gmail.com>
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Hello all,

I have a question that is not very specific to radiance usage but felt that
most of the online forum users might have a good idea about it:

Though light shelves are widely perceived to bounce daylight into interiors
off of the ceiling and also cut down glare, they are more effective in
cutting down the glare and do not actually increase the daylight levels at
the back of the room.

True or false? Why?

Thanks in advance,

Ramana Koti, Sustainable Building Analyst
LEED AP

ELEMENTS | a division of berkebile nelson immenschuh mcdowell architects
106 W. 14th Street Suite 200
Kansas City, Missouri 64105

p 816.783.1635 f 816.783.1501
www.bnim.com| elements.bnim.com

Mobile Phone: 480.326.9275
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